Headstock-brake



H. c. DRAKE AND A. 'SLAGENHAUF.

HEADSTOCK BRAKE.

APPLICATION FILED MAR- 5. 1919.

1,327,656, Patented Jan. 13, 1920.

UNITED STATES PATENT OFFICE.

HARCOURT C. DRAKE AND AUGUST SLAGENHAUF, OF BROOKLYN, NEW YORK.

HEADSTOCK-BRAKE.

Application filed. March 5,

To all whom it may concern Be it known that we, I'IAROOURT (l. DRAKE and AUGUST SLAGENHAUF, citizens of the United States, and residents of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Headstock-Brakes, of which the following is a specification.

This invention relates to a braking device for head-stocks and the like and has for an object a means for quickly stopping a revolving head-stock than can be easily applied without danger to the operator. Another object is to provide a braking attachment for lathes that can be applied without change in the existing structure and witlr out interfering with its normal operation. This invention is illustrated in the accompanying drawings in which, Figure 1, is a plan view of the braking attachment complete, Fig. 2, is an end elevation of the device in place on a head-stock and Fig. 3, is a corresponding side view.

In the ordinary course of running a lathe it is necessary to make frequent stops for inspection, measurement andv change of tools. A common way of stopping the head stock is by gripping the driving belt by handa procedure that is dangerous and does not secure an instant stop. The present invention provides means for applying a brake shoe to one of the driving pulleys of the head-stock without, however, interfering with the driving belt when running on this same pulley. In the drawings, 11 represents a head-stock of the usual type and, as shown in Fig. 2, this is driven by the belt 12 engaging the largest pulley 15, to this pulley the brake mechanism is also applied. A back gear is provided with the head-stock having a shaft 14 which is driven by spur gearing inclosed within the gear casing 13. To this shaft the bracket 24 is loosely attached as shown in Fig. 2, the plate 25 being detachable for this purpose. A lug 26 projected from 24 extends beyond 13 and engages its outer face as shown in Fig. 3; this preventsthe bracket 24 from moving along the shaft 14. Lug 26 may be adjustable to suit different sizes of the casing 13.

The operating lever 22 is curved to conform to the contour of the casing 13 over which it is placed. This lever is pivoted at 23 in the bracket 24 to provide for a hori zontal movement while the movement of the Specification of Letters Patent.

Patented Jan. 13, 1920.

1919. Serial No. 280,849.

bracket on shaft 14 provides for a vertical movement of this lever.

Arm 31 is secured to lever 22 by the screws 33, the position of this arm on the lever is adjustable to the extent of the slot 32, thus this arm may be centered between each side of the driving belt, as for instance when the belt takes up a new position 12, Fig. 2. The brake shoe 34 is secured to this arm by the pivot connection 35. The brake blocks 38 and 39 are securedto the brake shoe and may be replaced when worn. In order to hold the brake normally out of engagement with the pulley 15, a spring 36 is provided secured to the lever 22 and resting on the casing 13; tension on this spring may be adjusted by the screw 37.

The handle 21 is provided as an integral part of lever 22 for operating the brake and in cases where this is not convenient a means is provided for operating it by foot pressure as shown in Fig. 2. The pedal 43 pivoted at 42 applies tension to the connection. 41 and thus operates the brake; generally, the hand or foot method will be used as best suits the convenience of the operator.

The brake is applied by a downward pressure on the handle 21, this brings the brake block 38 into engagement with the pulley 15. The brake is also applied by moving the handle horizontally, this brings the brake block 39 into engagement with the face 16 of pulley 15; obviously a combination of these movements may be used for braking purposes. It is apparent that lever 22 must not swing toward the belt, this is secured by shoulder 27 on bracket 24 which engages the lever 22. Freedom of movement in the opposite direction is secured by the rounded corner 28 enabling the lever to turn on the pivot 23.

Having thus described our invention, we claim 1. In a head-stock brake, the combination, a revolving head-stock driven by a belt, a back gear shaft having a detachable bracket, an arm pivotally secured to said bracket and extending transversely to the axis of said head-stock, a brake shoe secured to said arm and arranged to engage said head-stock between the sides of said belt, and means for applying said brake.

2. In a head-stock brake, the combination, a revolving head-stock driven by a belt having various positions, an arm pivotally secured at one side of and extending transversely to the axis of said head-stock, a brake shoe secured to said arm and extending between the sides of said belt, said shoe adjustable with relation to said belt, and means for applying said brake.

3. In a head-stock brake, the combination, a revolving head-stock driven by a belt, an arm pivotally secured adjacent to said head-stock to swing in a vertical and in a horizontal direction and extended transversely to the axis of said head-stock, a brake shoe secured to said arm and arranged to engage said head stock when the arm is moved about either its horizontal or vertical pivot.

4. In a head-stock brake, the combination, a revolving head-stock driven by a belt, an arm pivotally secured adjacent to said head-stock to swing in a horizontal direction close to said belt and extending transversely to the axis or said head-stock, a brake shoe secured to said arm and arranged to engage said head-stock, and means for preventing said arm from moving toward said belt.

5. In a head-stock brake attachment, the combination, a head-stock driven by a belt, a back gear, a gear case, a bracket loosely secured on said shaft, an arm secured to said bracket and extending above and following the contour of said gear case, a brake shoe extending from said arm between the sides of said belt, and means for applying said brake.

6. In a headstock brake attachment, the combination, a head-stock driven by a belt, a back gear, a gear case, a bracket loosely mounted on said back gear shaft and having means engaging said gear case to hold it in position, an arm secured to said bracket and extending above said gear case, a brake shoe extending from said arm between the sides of said belt and means for applying said brake.

7. In a head-stock brake attachment, the combination, a head-stock driven by a belt, a gear case, an arm pivoted at one side of and extending transversely to the axis of said head-stock above said gear case, a brake shoe extending from said arm to ensaid head-stock, and means engaging said gear case for normally holding said brake shoe out of engagement with said head-stock.

Signed at Brooklyn in the county of Kings and State of New York this 3rd day of March, A. D. 1919.

HARCOURT G. DRAKE. AUGUST SLAGENHAUF. Witnesses:

WALTER Row, M. J. KELLY. 

